I just wanted to interject.
I was having a similar problem. I would load a track for editing, but when I click the play button, the play button would light green but the transport wouldn’t move. Having checked all my settings and sample rates, I turned my attention to the Master Clock and noticed it was set to ‘In’. This means, it’s waiting for a clock time-code signal on the audio input line to trigger playback. Since I don’t have an external master clock, I set it to ‘Out’ making my computer the master clock.
This solved my problem and operation has been normal ever since.